<!DOCTYPE html>
<html>
<head>
	<title></title>
	<style type="text/css">
		.father{
			width: 500px;
			height: 500px;
			position: relative;
			background: red;
		}
		.box{
			width: 400px;
			height: 400px;
			background: green;
			position: absolute;
		}
		.son{
			width: 300px;
			height: 300px;
			background: pink;
			position: relative;
		}
		.sunzi{
			width: 200px;
			height: 200px;
			background: orange;
			position: absolute;;
			right: 10px;
		}
	</style>
</head>
<body>
	<div class="father">
		<div class="box">
			<div class="son">
				<div class="sunzi"></div>
			</div>
		</div>
	</div>
</body>
</html>